Refrigerating machine



March 20,1934. T E. KAGI v 1,951,915

REFRIGERATING MACHINE Filed May 13. 1950 @1911 Baal. MW #5191044 ,ATFD NEV.

Patented Mar. 29, 1934- a A? if nnrnicaaa'rnse moms Emil nagi,-Winterthur, Switzerland, assignor to the firm Sulaer lFrres SocieteAnonyrne, Winterthnr, Switzerland Application May 13, 1939, Serial No.451333 1 Claim.

This invention relates to refrigerating machines and is particularlyconcerned with machines as described in U. S. application Ser. No.=388,132 filed August Ztth, 1929. The object of the invention is toprovide an improved means for automaticalls returning to the compressorof a refrigerating machine oil used for lubrication and sealing theclearances of the moving parts.

According to this invention the chamber which m is maintained at a lowerpressurefthan' the evaporator and to which the discharge'pipe' of theoil accumulator is connected, constitutes the suction chamber or aninjector which is operated by the refrigerating medium supplied to thecompres- 35 sor. As a result the oil is automatically returned to thecompressor with less loss of power than hitherto and without adverselyaffecting the evaporation temperature.

A construction according to the invention is 39 dia atically illustratedby way of example in the accompanying drawing. t

The reirigerating medium is supplied to the compressor 1 by the pipe 8from the evaporator 4 as in the main patent and the evaporator has anoil accumulator 26 from which Cl is discharged through the pipe 27.

According to this invention, the chamber which is maintained by thesuction of the compressor at a lower pressure than the evaporator andinto 30 which the oil discharge pipe opens, instead of being arranged ashitherto in the compressor itself,

is made the same as the suction chamber 36 of an injector-3'7. Thisinjector is so connected to the A in Switzerland (icteber 1, 12 29 atedby the refrigerating medium. Oil collecting in the chamber 28 is thusdrawn up into the chamber 36 without appreciable loss of pressure oi therefrigerating medium and, when the chamber 36 is approximately full, theoil is carried away by the rapidly moving refrigerating medium andreturned to the compressor in an atomized state.

I claim:

A refrigerating machine employing a refrigerating liquid and a lubricantheavier than said liquid, comprising a. main evaporator, a compressor,and means between said main evaporator and said compressor for returningthe lubricant heav- Y ier than the refrigeratiing liquid, and therefrigerant, from said main evaporator directly to.

said compressor therefrom, said means including an injector located inthe direct path between the outlet from the evaporator and the inlet tothe compressor and having a pressure chamber and a suction chamber, alubricant collector for collecting lubricant sinking by gravity andseparating from the refrigerant, a discharge pipe connecting theseparated lubricant in the bottom of said collector to the suctionchamber of said injector, and a pipe leading directly from the pressurechamber of said injector directly to the compressor without passingthrough any intermediate apparatus, whereby the pressure in thedischarge pipe from the said collector to said suction chamber ismaintained lower than the pres sure at the outlet end of the mainevaporator and the oil is returned to the compressorwithout altering theevaporator temperature.

1 f 7 EMIL KAGI.

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